design: type parameters: clarify depth of embedded type constraint methods
For golang/go#43621
Change-Id: Ice63bffb753a1c429ee3537cb3093f2903d499d6
Reviewed-on: https://go-review.googlesource.com/c/proposal/+/283113
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
diff --git a/design/go2draft-type-parameters.md b/design/go2draft-type-parameters.md
index 297b6c2..c75eb75 100644
--- a/design/go2draft-type-parameters.md
+++ b/design/go2draft-type-parameters.md
@@ -2,7 +2,7 @@
Ian Lance Taylor\
Robert Griesemer\
-November 25, 2020
+January 11, 2021
## Abstract
@@ -3832,6 +3832,11 @@
When a generic type is a struct, and the type parameter is embedded as
a field in the struct, any methods of the type parameter's constraint
are promoted to be methods of the struct.
+(For purposes of [selector
+resolution](https://golang.org/ref/spec#Selectors), these methods are
+treated as being at depth 0 of the type parameter, even if in the
+actual type argument the methods were themselves promoted from an
+embedded type.)
```
// NamedInt is an int with a name. The name can be any type with
